Counterbalancing device for shafts



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ATroRlvEyj Patented Oct. 25, 1927.

UNITED STATES PATENT OFFICE.

JOHN L. BURNS, OF SYRACUSE, NEW YORK, ASSIGNOR T H. E. FRANKLIN MANUFAC- TUBING COMPANY, OF SYRACUSE, NEW YORK, A. CORPORATION OI NEW YORK.

OOUNTERIBALANGIN G DEVICE FOR SHAETS.

Application filed November This invention relates to counterbalancing means for rotating shafts, particularly the crank shafts of internal combustion engines which are subject to vibrations due to the explosions in the cylinders and has for its object a particularly simple and efiicient means for neutralizing or absorbing the vibrations of the crank shaft.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is made to the accompanying drawings.

Figure 1 is a fragmentary vertical sectional view of a crank shaft provided with one form of my invention.

Figure 2 is a fragmentary elevation of an engine provided with a fly wheel at its front end.

Figure 3 is a detail view of a crank shaft having the ordinary fly wheel, provided with my invention.

This vibration or shock absorbing means for shafts, as crank shafts, comprises a centrifugal element mounted on the shaft and rotatable therewith and including an inner member or hub, .an outer annular member and an intermediate member connecting the former members and formed of a vibration so absorbin material as a fibrous, non-rigid, if

not flexi le, material. 1

In Figure 1, the centrifugal element is shown as the fan on' the front end of the crank shaft on a Franklin air cooled en 'ne.

1 desi ates the crank shaft whic is mounted in any suitable manner in the crank case.

2 is the centrifugal element or fan located in the fan casing 3. The element 2 comprime an inner member or hub 4 mounted on the front end of the crank shaft 1 to rotate therewith, an outer annular rim portion or'member 5 which carries the blades 6 of the fan and an intermediate element 7 conlnecting the inner and outer elements 4 The element! is shown as consisting of two annular disks of a fibrous compound 23, 1925. Serial No. 70,764.

which is not rigid, if not very flexible, the disks being arranged on the front and rear sides of the annular flanges 8 and 9 on the hub 4 and outer member 5 and being secured thereto by fastening members 10 extending transversely through said disks and said flanges, the fastening members being usually rivets. The disks, to some extent not only absorb the shocks and vibra tions from the crank shaft and keep them from being transferred to the centrifugal member as the fan or fly wheel, but also to some extent neutralize the vibration by permitting the centrifugal member to tend to assume its own axis of rotation, within limits.

In Figure 2, the centrifugal member is shown as a fly wheel 11 mounted on the front end of the crank shaft 12 and rovided with a pulle '13 for a belt 14 w ich drives the fan pul ey 15 of a watercooled engine. 70

In this construction shown in Figure 2, 7 designates the annular disks of vibrating absorbing material which connect the inner member or hub 4 with the outer member or rim of the fly wheel. 75

In Figure 3, an ordinary fl wheel 20 is shown, the rim 21 of WhlCh is connected to the hub 22 by flexible disks or washers 70.

What I claim is:

A counterbalancing device for rotating so shafts comprising a centrifugal element including a ub mounted on the shaft and having an annular flange an annular outer member and an intermediate member, the outer member having an internal annular flange and the edges of said annular flanges being opposed to and located close to each other, t e intermediate member being of a fibrous vibration absorbing material and lapping said flanges and being secured thereto.

In testimony whereof, I have hereuntosifgned my name, at Syracuse, in the coun O, Onon a and State of New York, this 28th day 0 October, 1925.

' JOHN L. BURNS. 

